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If your power steering went out one direction at a time, it most certainly has to be the steering gearbox causing the problem. All the control valving is in the box. The pump just pumps constantly and the box either bypasses or directs pressure and flow.

2 inches @ the steering wheel? i do not recommend tampering with the screw on the gearbox. that is for adjusting the sector shaft, usually only adjusted on high mileage gearboxes. since most of your driving is straight the gearbox worm gear wears out in that position, by adjusting it, it tightens up the gap in the gears the problem comes in when turning because it can be too tight on the ends of the shaft possibly binding up in your gearbox.and no matter what happens next it probably wont be good. try checking the couplings in the steering shaft. with the vehicle off, steering unlocked, have someone move the steering wheel left and right making sure not to move the tires, your looking to see play at all joints, couplings, or pivots. where you see one piece moving and the other not.

Its most likely a seal on the power steering rack by the age it will most likely just be a seal they are about £7 in UK but possible the rack is goosed although I doubt it, please be careful using the car as it can lock the steering in position, and,,,, well you get it.

Problems associated with low power steering fluid…Hard Vehicle SteeringA low power steering fluid level can often times cause a vehicle's steering to become hard and labored. Adequate amounts of power steering fluid are necessary to enable a vehicle's power steering system to function and operate at optimum levels. A lack of power steering fluid in a vehicle's power steering system reduces the amount of hydraulic fluid pressure necessary to efficiently operating the various parts of the entire power steering system. Power steering fluid supplies the fluid force needed to operate the power steering gears and to enable power steering gearbox operation. Low power steering fluid levels reduce this hydraulic pressure, which commonly results in hard vehicle steering.Pump NoiseIt is very common for a low power steering fluid level to cause significant power steering pump noise. An adequate amount of power steering fluid is required to ensure the proper function and longevity of a power steering pump unit, which is a belt-driven pump responsible for housing and circulating power steering pump fluid. A low level of power steering fluid results in increased power steering pump friction, heat, and wear, all of which can significantly reduce the operational life of the power steering pump while at the same time cause excessive power steering pump noise. Fluid Boiling
Many times a low power steering fluid level can result in excessive heating of power steering fluid, a condition that can seriously degrade the fluid and cause it to boil. A low power steering fluid level results in less available fluid to both lubricate and cool a power steering pump unit. A lack of power steering pump lubrication and cooling leads to excessive heat being generated within the power steering pump unit itself, a condition that translates into the available level of power steering fluid becoming super-heated and degraded. When this happens it is common for the power steering fluid to boil and lose all of its lubricating and heat-reducing capabilities.

Gearbox Wear
The power steering gearbox is a set of gears within a vehicle's power steering system designed to facilitate movement of a vehicle's front wheels. The power steering gearbox is connected to the power steering pump by hydraulic fluid lines that deliver a constant supply of power steering fluid to the power steering gearbox. A low power steering fluid level, especially a chronic and severe low power steering fluid level, can lead to increased friction and wear within the power steering gearbox assembly, a condition that can significantly shorten the operational life of the power steering gearbox and negatively affect its operation

There is usually no diagram for the power steering on a vehicle. On power steering you have a pressure line and a low pressure return line. The pump is located on the front of the engine and has a line that is bolted into it, this is the pressure line coming out going to the steering gearbox where it is bolted in also. The other line has a clamp holding it in place, this is the low pressure return line coming back from the gearbox. If the gearbox is the rack and pinion steering type then you may have a couple of extra high pressure lines on it to operate the rack portion of the steering. Good Luck, RAC

you could have air in the system. first try an fill the resevoir to a proper level then with engine running turn steering wheel all the way to the left until it squeals, then to the right till it squeals. repeat this several times if this doesn't cure the problem change the pump only I seriously don't that the gearbox is bad. please rate this